Interrogation officers

The Chief Interrogator was Group Captain Samuel Denys Felkin, who was in charge of the Air Intelligence Section, known as ADI(K). He headed a team of approximately 100 male and female interrogators and administration staff. Felkin had served as a pilot during WWI and then with British troops in post-war Germany. He had a fluent knowledge of German, which he used in interrogations.

At the outbreak of war in 1939, he was drafted straight into the M Room unit at the Tower of London, where he was put in charge of all prisoner interrogations for the duration of the war. Felkin was known to prisoners under a false name, Oberst King, in order to hide his true role working for the British Secret Service. He was easy-going and likeable, and worked hard to exploit every opportunity to gain intelligence from the prisoners. Occasionally he took a prisoner for a walk along the King's Walk at Latimer House and confided to them what he knew about Germany. The prisoner would say very little in return, but they would part on friendly terms as equal military men. The prisoner returned to his cell and often explained to his cellmate what the English officer knew and precisely what he, the prisoner, had withheld from him. That immediately released the information Felkin needed to know, which was recorded by the secret listeners.